<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			.tudou {
				position: relative;
				width: 444px;
				height: 320px;
				background-color: pink;
				margin: 30px auto;
			}
			img {
				width: 100%;
				height: 100%;
			}
			.mask {
				display: none;
				position: absolute;
				left: o;
				top: 0;
				width: 444px;
				height: 320px;
				background: rgba(0,0,0,0.4) url(img/土豆案例p248/arr.jpg) no-repeat center;
			}
			.tudou:hover .mask {
				/*显示元素*/
				display: block;
			}
		</style>
	</head>
	<body>
		<div class="tudou">
			<div class="mask"></div>
			<img src="img/土豆案例p248/tudou.jpg"/>
		</div>
	</body>
</html>
